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Preparation methods of antioxidant, water-retaining agent, mixture, and modified fuel cell membrane electrode

A fuel cell membrane and antioxidant technology, used in fuel cells, circuits, electrical components, etc., can solve the problems of increasing the complexity of the fuel cell system, increasing the permeation flux of MEA gas, and reducing the thickness of the proton exchange membrane. Excellent chemical stability, long-lasting water proton conductivity, and the effect of reducing the loss of phosphoric acid

Active Publication Date: 2019-09-20
SHENZHEN GENERAL HYDROGEN ENERGY TECH CORP LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0017] Free radicals lead to the degradation of the chemical structure of the proton exchange membrane, which reduces the thickness of the proton exchange membrane, and even perforates to form pinholes, which increases the gas permeation flux of the MEA and reduces the performance of the MEA.
[0018] Second, the stability of the physical structure of the membrane electrode (during the use of the proton exchange membrane, the cycle stress will be caused by the dry-wet cycle, which will lead to the degradation of the physical structure of the membrane)
[0020] 3. The problem of water content reduction in membrane electrodes
The second is the directional drag phenomenon of water molecules due to the directional migration of protons
[0022] 2. At present, in the use of fuel cells, most of them use humidification of the gas entering the fuel cell to ensure the water content of the proton exchange membrane. The introduction of the humidification auxiliary system will undoubtedly increase the complexity of the fuel cell system. Prone to flooding during battery operation

Method used

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  • Preparation methods of antioxidant, water-retaining agent, mixture, and modified fuel cell membrane electrode
  • Preparation methods of antioxidant, water-retaining agent, mixture, and modified fuel cell membrane electrode

Examples

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preparation example Construction

[0081] A method for preparing a membrane electrode of a fuel cell, which is a major improvement over the traditional transfer printing method, comprising the following steps:

[0082] a) directly coating the perfluorosulfonic acid resin (PFSA) solution on the surface of the obtained first catalyst layer; drying treatment; preparing a PEM membrane;

[0083] b) Coating the catalyst slurry on the outer surface of the dried PEM membrane in a certain way; drying to obtain the second catalyst layer; and then heat-treating to obtain the membrane-electrode structure.

[0084] The advantage of this preparation method is: the surface of the direct catalyst layer forms a PEM film, which reduces the resistance of proton transfer between the catalyst layer and the proton exchange membrane interface; The proton exchange membrane can be better wetted during the process; the preparation process of the proton exchange membrane is integrated into the preparation process of the membrane electrod...

Embodiment 1

[0088] Embodiment 1: antioxidant and its application on membrane electrode

[0089] In order to alleviate the phenomenon of chemical degradation of PFSA resin under the attack of free radicals, this application studies the composite membrane containing free radical quencher.

[0090] The perfluorosulfonic acid resin (PFSA) solution is directly coated on the surface of the first catalyst layer (the back film-the first catalyst layer has been obtained in advance in a certain way, or the gas diffusion layer-the first catalyst layer has been obtained) , there are two implementation options:

[0091] The first scheme is: take the gas diffusion layer as the starting material (substrate) for preparing the membrane electrode as an example. First coat a layer of catalyst slurry on the surface of the gas diffusion layer to form a gas diffusion layer-the intermediate of the first catalyst layer; then coat the catalyst slurry on the surface of the antioxidant layer to form a gas diffusion ...

Embodiment 2

[0109] Embodiment 2: water retaining agent and its application on membrane electrode

[0110] This example discloses a formula of a water-retaining agent, which is used for fuel cell membrane electrodes to improve its water-retaining performance, and includes the following components: the first group: perfluorosulfonic acid resin solution; Amino group, polyhydroxy polymer macromolecule composition, solvent, catalyst, polyhydric organic phosphonic acid small molecule and its esters.

[0111] In the case of no external humidification of the fuel cell, the water generated by the electrochemical reaction on the cathode side is the only source for the proton exchange membrane to keep wet. In this case, there are two forms of transfer of water molecules: one is the backdiffusion of water from the cathode to the anode under the action of the concentration gradient, and the other is the migration of water from the anode to the cathode under the action of electroosmosis. Therefore, ad...

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Abstract

The invention discloses preparation methods of an antioxidant, a water-retaining agent, a mixture and a modified fuel cell membrane electrode. The invention discloses a preparation method of the modified fuel cell membrane electrode, which comprises the following steps: a) preparing an antioxidant, or a water-retaining agent, or a mixture with antioxidant and water-retaining functions, and preserving the mixed solution for later use; b) coating two sides of a microporous reinforced membrane with the mixed solution obtained in the step a) by using a coating device, and drying the membrane to obtain a modified perfluorosulfonic acid proton exchange membrane; c) processing the modified PEM membrane to prepare the fuel cell membrane electrode. The invention further discloses a formula and a preparation method of the antioxidant, a formula and a preparation method of the water-retaining agent, a formula and a preparation method of the mixture with antioxidant and water-retaining functions, and applications of all the products hereinabove in the fields of membrane electrodes and fuel cells. According to the invention, the chemical structure degradation phenomenon of the proton exchange membrane caused by free radicals is effectively relieved, the lasting water retention performance of the proton exchange membrane is improved, the proton conductivity is improved, and the mechanical property of the membrane electrode is improved by adopting the enhanced microporous membrane, so that the stability of the membrane electrode is enhanced, and the service life of the membrane electrode is prolonged.

Description

technical field [0001] The present invention relates to the technical field of fuel cell membrane electrodes, in particular to an antioxidant, a water retaining agent comprising a mixture of an antioxidant and a water retaining agent, a method for preparing a modified fuel cell membrane electrode, and a proton Exchange membrane fuel cell system. [0002] Specifically, it relates to a free radical quencher for improving the oxidation resistance of PEM (proton exchange membrane), a water retaining agent for improving the water retention capacity of PEM, a porous matrix support material for improving the mechanical properties of CCM, and the Free radical quenching agent, water retention agent, porous matrix support material (such as microporous enhanced membrane) are applied to PEM modification, and the modified PEM membrane is prepared, and the modified PEM is applied to the fuel cell membrane electrode, and the fuel Battery membrane electrodes are used in fuel cell systems. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D127/18C09D7/61C09D7/65C09D7/63H01M8/1004H01M8/1039H01M8/1048H01M8/1051H01M8/1088
CPCC09D127/18C09D7/61C09D7/63C09D7/65H01M8/1004H01M8/1039H01M8/1048H01M8/1051H01M8/1088Y02E60/50
Inventor 樊建涛黄衡恢王海江李辉
Owner SHENZHEN GENERAL HYDROGEN ENERGY TECH CORP LTD
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